<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bootstrap</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
  <div class="container">
    <div class="row">
      <div class="col-xs-6 col-md-3">
        <a href="#" class="thumbnail">
          <img src="img/google-logo.png" alt="">
        </a>
      </div>
      <div class="col-xs-6 col-md-3">
        <a href="#" class="thumbnail">
          <img src="img/box-logo.png" alt="">
        </a>
      </div>
      <div class="col-xs-6 col-md-3">
        <a href="#" class="thumbnail">
          <img src="img/square-logo.png" alt="">
        </a>
      </div>
      <div class="col-xs-6 col-md-3">
        <a href="#" class="thumbnail">
          <img src="img/intuit-logo.png" alt="">
        </a>
      </div>
    </div>
  </div>

  <div class="container">
    <div class="row">
      <div class="col-sm-6 col-md-4">
        <div class="thumbnail">
          <img src="img/google-logo.png" >
          <div class="text-center">
            <h3>Thumbnail label</h3>
            <p>课程</p>
            <p><a href="#" class="btn btn-primary" >按钮</a></p>
          </div>
        </div>
      </div>

      <div class="col-sm-6 col-md-4">
        <div class="thumbnail">
          <img src="img/google-logo.png" >
          <div class="caption">
            <h3>Thumbnail label</h3>
            <p>...</p>
            <p><a href="#" class="btn btn-primary" role="button">Button</a> <a href="#" class="btn btn-default" role="button">Button</a></p>
          </div>
        </div>
      </div>

      <div class="col-sm-6 col-md-4">
        <div class="thumbnail">
          <img src="img/google-logo.png" >
          <div class="caption">
            <h3>Thumbnail label</h3>
            <p>...</p>
            <p><a href="#" class="btn btn-primary" role="button">Button</a> <a href="#" class="btn btn-default" role="button">Button</a></p>
          </div>
        </div>
      </div>

    
    </div>
  </div>
<script src="js/jquery-3.6.0.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>